Steep Slope Metal

Steep Slope Metal

1. General Product Information

1.1 Product Type
1.2 Roofing Categories
1.3 Product Manufacturers
1.4 Manufacturing Process
1.5 Industry-Specific Standards, Codes Requirements, and Compliance
1.6 Unique Industry-Specific Flashing and Metal

Steep slope metal roofing is used on homes to provide energy savings, beauty, and protection. Residential metal roofs are available in a wide variety of designs and colors to complement any style home. Metal roofs can be a traditional vertical seam profile, or be manufactured to resemble wood shake, slate, shingles or clay tiles. Many residential metal roofs now utilize reflective pigment technology, which results in overall home energy efficiency, and lower utility bills. In addition, all metal roofs are made from a minimum of 25% recycled material. Resistant to cracking, shrinking and eroding, metal roofing systems can also withstand extreme weather conditions including heavy snow loads, hail storms and wildfires.
http://www.metalroofing.com/v2/content/metal-roofing/why-metal.cfm#sthash.KBHezRMj.dpuf

1.1 Product Type

1.1.1 Residential Metal Roofs Description

1.1.2 Identification-Traceability

1.1.3 Packaging and Storage

1.2 Roofing Categories

Metal roofing can be categorized as being either hydrostatic (water tight) or hydrokinetic (shedding water).
Metal Roof Installation Manual — Chapter 10: http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_10

1.2.1 Low Slope

Structural metal roofing is typically low slope hydrostatic and can be installed with no solid deck.
http://www.metalroofing.com/v2/content/guide/types/

1.2.2 Steep Slope

Architectural metal roofing is typically steep slope hydrokinetic and uses a solid deck.
http://www.metalroofing.com/v2/content/guide/types/

1.2.3 Roof Pitch Limitations

Steep slope, hydrokinetic metal roofing is normally installed at slopes of 2:12 or greater.
Metal Roof Installation Manual – Chapter 2,3, 4 and 10:
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_2
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_3
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_4
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_10

1.2.4 Substrates and Finishes

Metal roofing is manufactured from a variety of metals and alloys. These same materials are often coated in the factory with high performance paint systems. The combination of the substrate and the paint systems (for painted metals) impact the durability of the metal roof system. The most common unpainted metal roofs are aluminum (0.023-0.040 thickness), metallic-coated steel, copper, stainless steel and zinc. Steel (24-26 gauge) is the most commonly used roofing material.
Metal Roof Installation Manual – Chapter 3: http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_3

NCCA Toolkit #8: Coil Coating Topcoat Systems: http://www.coilcoating.org/toolkits

http://www.coilcoating.org/index.php/education/tutorials#prettyPhoto[view]/16/

1.3 Product Manufacturers

Manufacturers of metal roofing can be found in the Product Locator section of the Metal Construction Association and the Metal Roofing Alliance websites.
http://www.metalconstruction.org/index.php/product-locator
http://www.metalroofing.com/v2/content/manufacturer/

1.3.1 Industry Trade Associations

The trade associations that support steep slope metal roofing are the Metal Construction Association, the Metal Roofing Alliance and the National Coil Coating Association.
http://www.metalconstruction.org/
http://www.metalroofing.com/
http://www.coilcoating.org/

1.4 Manufacturing Process

ricowi-metal-roof-panel-forming-1-4The manufacturing of steep slope metal roofing involves the rollforming and/or pressforming of a variety of unpainted and painted metal panels of differing substrate metals or alloys. The forming process imparts a variety of profiles that provide aesthetic and structural qualities of the roof panels.

1.5 Unique Industry-Specific Standards and Codes

1.5.1 Hail

1.5.2 Wind

1.5.3 Fire

1.5.4 Cold Climate

1.6 Unique Industry-Specific Flashing and Metals

2. Installation Guidelines

2.1 Best Practices
2.2 Roof Weights and Re-Roofing
2.3 Roof Support or Sheathing Materials Options
2.4 Underlayment Options
2.5 Installation Methods

2.1 Best Practices

2.2 Roof Weights and Re-Roofing

2.3 Roof Support or Sheathing Materials Options

2.4 Underlayment Options

2.5 Installation Methods

Panels can installed using threaded fasteners or nails, depending on the manufacturers’ recommendations for the type and location of the roof project. Fasteners can be through the metal panels or concealed. Through-fasteners utilize a washer or gasket to seal the location. Concealed fasteners are attached to a structural support and allow for the metal panel to move from thermal expansion and contraction.

Metal Roof Installation Manual – Chapter 5 and 10: http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_5
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_10

2.6 Fasteners

Fasteners are a critical component in any metal roof installation. The proper fastener, and the proper installation technique, is recommended by the metal roof panel manufacturer. Fasteners differ greatly in their performance. The designated fastener is selected based on factors such as the material and thickness of the roof panel, insulation, substrate and structural members of the roof system. Other factors like wind resistance and roof load are also used in determining the correct fastener for the installation.

Metal Roof Installation Manual – Chapter 4, 7, 10 and 15: http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_4
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_7
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_10
http://www.metalconstruction.org/download.php/education/tech_resources/metal_roofs/MCA_Roofing_Installation_Ch_15

Fastener Compatibility with Profiled Metal Roof and Wall Panels [2015]: http://www.metalconstruction.org/index.php/education/tech_resources#fastner_compatibility

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Disclaimer: This manual has been prepared for informational purposes only. RICOWI, IBHS, and the participating roofing industry organizations expressly state that they have no liability, in negligence, tort, or otherwise, with respect to the use of any of the information and/or practices described in this article. The information set forth in this manual is provided in good faith. The user assumes the sole risk of making use of the information provided in this manual.

Users of this manual are strongly urged to follow accepted safety practices, refer to applicable local building codes and standards, and relevant manufacturers’ instructions for appropriate technical requirements, and to work with a qualified professional in order to operationalize the information contained herein. Photographs and examples contained in this manual are provided for illustrative purposes only and do not guarantee the condition of any specific product or the effectiveness of any repair or installation. Nothing contained in this manual is intended or written to be used, nor may it be relied upon or used, by any person and/or business as legal advice.

NOTE: The manual is being completed in sections, and will be released in stages. Check back often to see the most up-to-date edition of the guide.
Please report broken links or other issues to Simon Kellogg (skellogg@ibhs.org).